Adjusting mechanism for grinding-mills.



H. w. SPELLMAN & E. TW IGG. ADJUSTING MECHANISM FOR GRINDING MILLS.

APPLICATION FILED JAN. 10, X911.

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APPLICATION FILED JAN.10,1911.

1,1 05,380. Pa nted July 28,1914.

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HERBERT W. SPELLMAN AND ERNEST TWIGG, OF

ASSIGNORS TO LANDERS, FRARY AND CLARK,

A. CORPORATION.

NEW BRITAIN, CONNECTICUT, OF NEW BRITAIN, CONNECTICUT,

ADJUSTING MECHANISM FOR GRINDING-MILLS.

Specification of Letters Patent.

Application filed January 10, 1911.

Patented July 28, 191%. Serial No. 601,924.

To all whom it may concern:

Be it known that we, Hnnnnnr W. Srnm MAN and ERNEST TWIGG, citizens of the United States, both residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Adjusting Mechanism for Grinding-Mills, of which the following is a specification.

Our invention relates to improvements in adjusting mechanism for grinding mills for grinding coffee and the like, and the ob ects of our improvement are simpliclty and economy of construction and to provide an indicator showing the degree of fineness to which the adjusting mechanism is set.

In the accompanying drawings: Figure 1 is a front elevation of our adjusting mecha nism and so much of a grinding mill as is deemed necessary to show its connection therewith. Fig. 2 is a vertical section of some of the parts on the line as m of Fig. 1, and a side elevation of the other parts. Fig. 3 is an enlarged sectional view on the line y g of Fig. 2. Fig. 1 1s a front elevation of the major portion of that part of the case to which we apply the adjusting screw and indicator, the said screw and indicator being removed. Fig. 5 is a broken out rear elevation of the indicator.

A designates a portion of the case of a grinding mill, the said portion being hollowed out to receive the moving mill disk, not shown, while a bearing for the mill shaft 6, which is shown as broken off, is formed in the hub 7 of the said case A. This hub is counter bored and internally threaded to receive a mill adjusting screw 8, the inner end of which bears against a hard fiber disk 9 placed between the confronting ends of the screw and shaft. The screw is provided with a knob 10 for convenience of operating the same. Turning the screw inwardly will force the shaft longitudinally inwardly and thus carry the moving disk, which is mounted on the said shaft, toward the companion fixed disk and thus adjust the mill for finer grinding. Turning the screw in the reverse direction to unscrew it, will permit the shaft and moving disk to move in the opposite direction to adjust the mill for coarser grinding, all substantially the same as in various mills of ordinary construction.

lVe improve the ordinary adjusting mechanism by the addition of certain parts as follows: We provide the middle or body portion of the adjusting screw with a toothed gear or pinion 11 and the hub 7 of the case A with an upwardly extended bracket 12, the upper part of which bracket is bored through from front to rear to form a hearing for the hollow indicator shaft or stud 13. This shaft carries a rotary indicator 1 1, the said indicator being provided with a toothed gear 14 for engagement with the gear or pinionll of the screw 8. This indicator is of a larger diameter than the gear on the screw and has more teeth so that more than one revolution of the screw is necessary in order to turn the indicator one complete revolution. The proportion should be such that one revolution of the indicator will require the screw to be moved longitudinally far enough to cover the entire range of the intended mill adjustment. As shown one and a half revolutions of the screw is necessary to move the indicator a complete revolution and turning the screw this distance the entire range of adjustment intended for this mill is accomplished. The face of the indicator has a circle of numbers thereon to indicate the degree of fineness to which the mill may be set. As shown these numbers run from 1 to 12, the lower numerals inclicating a coarse set and the larger a fine set; number one indicating the coarsest adjust ment that will ever be required, while twelve indicates the finest that can be made. The indicator is covered and protected by a two part case, the front part 15 being cup shaped to cover the front and main portion of the edge, while the rear part 16 covers the rear. The cup shaped front part is rigidly mounted on the front end of the hollow indicator shaft or stud, while the rear part is loosely placed on the said stud with its edge shutting into the edge of the front part. In order to bring the teeth of the indicator in engagement-with the teeth on the screw and permit of placing and removing the indicator by a movement from front to rear in the longitudinal direction oi? the screw and in the line of the indicator axis it is necessary to cut away the upper part of the hub at its front end as best shown at 17 in. 4. This cut away portion is filled by a projection 18 0f corresponding shape on the front of the front part 15 of the indicator case and gives the said end of the hub its completed form. The lower edge of the indicator case is also cut away to clear the teeth on the screw as shown in Fig. 5. The indicator and its case are held in place by a screw19 inserted into the shaft or stud 13 from the rear of the bracket 12. In order to prevent an accidental movement of the indicator, we provide a frictional holder in the form of a pin or plunger 29 and a spring 21, both of which are placed in'a hole at the lower'part of the bracket 12 with the outer rounded end of the plunger bearing on the rear sides of the indicator 141, a circle of cavities 22 being formed in the said rear side'immediately in front of the said plunger. A hole 23 is made through theback or rear part 16 of the indicator case to permit the front end of the plunger to pass 'therethrougln The front part'15 of the case is provided with an index opening 2 1 through which to read the numbers on the indicator whenever they are presented thereto.

In order to properly set the indicator for use/the adjusting'sc rew 8 is't-urned in the right hand direction to move" it and the shaft 6 inwardly to the extreme limit'ot finest adjustment, that is until'the mill disks are brought together] Then place the indicator and its stud in position for insertion, the teeth of the indicator being 'in'fr'o'nt or the front end of the pinionor 11 on the screw; set the indicatorso that the number 12 is indicated through the index opening and then. move the indicator into place by a movement in the line of its anisand bring its teeth into engagement with the teeth of the pinion on the screw. Thescrew 19 may the'n'be inserted to hold the parts'i'n place, and then, until reset, the number; 12 at'the index opening will indicate that the mill adjusted for the finest grinding) As the adjusting screw is unscrewed to draw it outwardly, the numbers showing through theindex opening are successively smaller and indicate that the mill is set for coarser grinding. It will s'eldom, ifever, be'nc essarv to move the adjusting screw outwardly far enough to have the indicator show its first or smallestnumbei".

By our improvement the user of the mill can tell at a glanccwhether the inill is ad justed for coarse or finegrinding, or how fine or how coarse when set at points hetween the two extremes. The construction and arrangement are such that with the intended range of adjustment the indicator does not make more than one revolution and consequently will not indicate 12 'or 11 or other fine adjustment for a coarseone. If, however, the indicator should be turned m r than me rev lut e in adju t n the mill for coarser grinding, that fact will be justing's'crew, s'o-that any misreading would not be likely to follow. By setting the indicator at 12 when the mill is adjusted for the finest grinding it will be impossible to turn the adjusting screw inwardly far enough to expose a small number on the indicator when the "mill" isadjusted rofifiae erie naf The construction is simple, inexpensive and durable, and 'the indicator, although a great convenience to the user requires no special attention or manipulation on his part other than to read the number presented to view. i

\Ve claim as our invention:

1. The arrangement and combination of a case, an adjustin screw fitted in'th ejsaid case, a driving gear mounted thereon and ran e f f b l liis t a g e r i i rotatively, an'"in'dicator comprising two parts 'one' fixed and the other rotary, 'the rotary part havinga toothed gear' for engagement with thesaid driving gear, guiding and supporting members for said in dicator formed respectively in and on the said case and indic ato'r and arranged tor r e la tiyelv sliding one upon the other in the longitudinal direction of the said screw, and a ifiistening'deyice for securing thesaid indicator in position "apes tie said case; whereby the said driving gear and indicator may each be s eparat'ely setin 1 a given position when the indicator is detached and then assembled properly by a sliding movement of the indicator on the said sliding and supporting members in the line ofthe axis of the said adjusting screw;

'2. The arrangement and combination of a maincase, a driving gear mounted inthe saidmaincase 'and rranged for being set in a given position rot-atively,"a and for being mounted in gt'fsocket in 'said main case to one sneer the axis or the an driving geartanindicator case separate "from the said main case'and rigi'dly'inounted on the nd studg' when indicate having atootlied 2 gear rotatively mounted within the said in dic'a'tor case for engagement"Withthesaid driving gear, whereby the said studfindi cator case and indicatormay be completed separately from the said main case and I driving gear and applied thereto after com ipletio'nfl i i indicated by the outward position of the ado adjusting screw, a main case in which the and connected parts Within the said socket smd screw 1s mounted, a socket having a of the said case.

4 i salsa izuizettssai sum SPELLMAN- H i ERNEST TWVIGG. dleator case rlgldly mounted on the szud stud, an indicator having a toothed gear Vii-mosses: l'otatively mounted Within the said indicator JOSEPH F. LAMB, case, and means for securing the said stud CLYDE BROADWELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

